Thanks for testing and sending this report! This patch relies heavily onthe functions exposed by the firmware. My first guess would be that some ofthese may not be implemented correctly by the manufacturer.

Could you share more information on this specific device?Do you have any link to the manufacturer website (I found [1] but it isbased on an ARM CPU)?Do you have the option to update your firmware? Is a copy of the firmwareavailable from the manufacturer?

On your side, I assume no error message got displayed on the screen whenbooting. Would you be able to try to boot in an UEFI shell [2] and executethe command "dh -v"?